Study of diffraction gratings for various profiles of the pit relief of a deformation

The influence of parameters of pit deformation on the diffraction efficiency η of relief phase diffraction gratings resulting from recording interference gratings in a simultaneous photothermoplastic process is studied. The depth of a pit, the height of a “breastwork,” and the height of the relief are considered among the parameters of the pit deformation. The quantity $sqrt eta The influence of parameters of pit deformation on the diffraction efficiency η of relief phase diffraction gratings resulting from recording interference gratings in a simultaneous photothermoplastic process is studied. The depth of a pit, the height of a “breastwork,” and the height of the relief are considered among the parameters of the pit deformation. The quantity is shown to be a linear function of the depth of a pit, the height of a breastwork, and the height of the relief in the actually (most often) used range of pit depths. The height of the relief produces the smallest effect on (the proportionality factor is 1), and the greatest effect is produced by the height of a breastwork (the proportionality factor is 2.5). The distribution of the height of the relief as well as the depth of a pit over spatial frequencies in the near-resonance region is found to be Gaussian. __________ Translated from Optika i Spektroskopiya, Vol. 90, No. 4, 2001, pp. 675–677. Original Russian Text Copyright ? 2001 by Panasyuk, Nastas.